In Situ Evolution of Pores in Lithium Hydride at Elevated Temperatures Characterized by X-ray Computed Tomography
| Autor: | Linsen Ye, Yifan Shi, Li Qishou, Lei Peng, Qiang Li, Wangzi Zhang |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
In situ
Materials science Hydrogen General Chemical Engineering Diffusion chemistry.chemical_element Inorganic Chemistry chemistry.chemical_compound General Materials Science Thermal stability Ceramic Porosity X-ray computed tomography Crystallography in situ pore evolution Condensed Matter Physics lithium hydride chemistry Chemical engineering Volume (thermodynamics) Lithium hydride elevated temperature QD901-999 visual_art visual_art.visual_art_medium |
| Zdroj: | Crystals, Vol 11, Iss 1093, p 1093 (2021) Crystals Volume 11 Issue 9 |
| ISSN: | 2073-4352 |
| Popis: | The evolution of defects such as pores at elevated temperatures is crucial for revealing the thermal stability of lithium hydride ceramic. The in situ evolution of pores in sintered lithium hydride ceramic from 25 °C to 500 °C, such as the statistics of pores and the 3D structure of pores, was investigated by X-ray computed tomography. Based on the statistics of pores, the porosity significantly increased from 25 °C to 200 °C and decreased after 200 °C, due to the significant change in the number and total volume of the round-shaped pores and the branched crack-like pores with an increasing temperature. According to the 3D structure of pores, the positions of pores did not change, and the sizes of pores went up in the range of 25–200 °C and went down after 200 °C. Some small round-shaped pores with an Equivalent Diameter of less than 9 μm appeared at 200 °C and disappeared at elevated temperatures. Some adjacent pores of all types connected at 200 °C, and some branched crack-like pores gradually disconnected with an increasing temperature. The expansion of pores at 200 °C caused by the release of residual hydrogen and the contraction of pores after 200 °C because of the migration and diffusion of some hydrogen in pores might be the reason for the evolution of pores with an increasing temperature. |
| Databáze: | OpenAIRE |
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